响应面分析法优化高分子重金属捕捉剂处理高浓度含汞溶液

Optimization of the Removal of Mercury from Its High Concentration Solution by Macromolecule Heavy Metal Flocculant based on Response Surface Methodology

采用L-1型高分子重金属捕捉剂处理高浓度的含汞溶液,考察了溶液pH、L-1投加量、反应时间和盐浓度对去除率的影响.采用响应面法通过Box-Behnken Design(BBD)实验设计对影响去除率的实验条件进行了优化分析.结果表明:二次多项式模型对实验数据的拟合度高,模型的预测值与实测值之间的相关性达96.41%,能够解释92.82%的响应值变化.采用响应面分析法优化得出处理100 mg/L的含汞溶液的反应条件为:pH值为5.0,L-1摩尔比为1.5,反应时间10 min,盐浓度为5 mmol/L,该条件下汞的去除率为99.96%,剩余汞浓度为0.04 mg/L,与模型预测值高度吻合.

High concentration mercury solution were treated by L^(-1) macromolecule heavy metal flocculant,and the effects of pH,L^(-1) dosages,reaction time,and salt concentration on the removal efficiency were investigated. By using response surface methodology,Box-Behnken Design( BBD) was applied to model and optimize the influence of the experiment variables on the response of removal rate. The results showed that the quadratic polynomial model fit the experimental data well. The correlation coefficient reached 96. 41% between the predicted and the real values,which could explain 92. 82% of the response variation. Based on response surface methodology,the reaction conditions for treating 100 mg/L mercury solution were optimized as: pH value of 5. 0,L^(-1) molar ratio of 1. 5,reaction time of 10 min,salt concentration of 5 mmol/L. Under these conditions,the removal efficiency of mercury was 99. 96% and the residual mercury concentration was 0. 04mg/L,both were highly consistent with the predicted values.